Add default multiworld configuration

This config file only includes settings that NC+ allows to set for each
word individually. So rename "WoRlDnAmEhErE" to the world name you want
to check differently and do /ncp reload. NoCheatPlus will first load the
global configuration file and override the settings with the world based
one afterwards. "savebackconfig: false" prevents NC+ from constantly
writing in new stuff if you decide to remove some settings.